區(qū)別主要是意思上的,語法上都作狀語
1.引導時間狀語從句：意思是“每當,隨時”,=when
I'd like to see you whenever it's convenient.在你方便的時候我想來看看你.
Come whenever you like.你隨時想來就來.
2.引導讓步狀語從句,= no matter when,意思是“不論什么時候,都.”
例如：I'll wait for you whenever you come.
You can eat food free in my restaurant whenever you like.
無論什么時候你都可以在我的餐館里免費吃飯.